1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2019 Tom Jones <thj@freebsd.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD$
28 */
29
30#ifndef _NETINET_DCCP_H_
31#define _NETINET_DCCP_H_
32
33/* DCCP protocol header as per RFC4340 */
34struct dccphdr {
35	uint16_t	d_sport;
36	uint16_t	d_dport;
37	uint8_t		d_doff;
38#if BYTE_ORDER == LITTLE_ENDIAN
39	uint8_t		d_cscov:4,
40			d_ccval:4;
41#endif
42#if BYTE_ORDER == BIG_ENDIAN
43	uint8_t		d_ccval:4,
44			d_cscov:4;
45#endif
46	uint8_t		d_cksum[2];
47#if BYTE_ORDER == LITTLE_ENDIAN
48	uint8_t		d_res:3,
49			d_type:4,
50			d_x:1;
51#endif
52#if BYTE_ORDER == BIG_ENDIAN
53	uint8_t		d_x:1,
54			d_type:4,
55			d_res:3;
56#endif
57       /*
58        * Provide enough space for both the short (24 bit) sequence number and
59        * the long (48 bit) sequene number and a leading reserved byte in
60        * front of the long sequence number.
61        */
62       union dccp_seqno {
63               uint8_t shortseq[3];
64               struct dccp_long_seqno {
65                       uint8_t res;
66                       uint8_t seq[6];
67               } longseq;
68       } d_seqno;
69};
70
71#define d_seqno_short d_seqno.shortseq;
72#define d_seqno_long d_seqno.longseq.seq;
73
74#define DCCP_SHORTHDR	12
75#define DCCP_LONGHDR	16
76#define DCCP_EXTHDR	0x80
77
78#endif /* _NETINET_DCCP_H */
79